Drill bit grinder and refacer

ABSTRACT

A fixture for retaining a drill bit during a grinding operation for refacing the same, the device including a slideable guillotine frame along a track bolted along a work bench, the guillotine frame including a fixed lower jaw with a v-shaped notch upon which the drill bit rests, and a vertically slideable upper jaw with an inverted V-shaped notch for placement against the upper side of the drill bit and securing the same during grinding operation.

llnite States Patent Howard Oct. 15, 1974 [54] DRILL BIT GRHNDER AND REFACEIR 2,284,483 5/1942 Whitesell 51/73 R 2,932,924 4/1960 Znchow t. [76] lnvemor- W Ward, Penna 3,490,884 1 1970 Brierley 51/73 R 22 Fi Sept 20 1973 Primary Examiner-Al Lawrence Smith Assistant ExaminerNicholas P. Godici [21] Appl 398,837 Attorney, Agent, or Firm-Merchant, Gould, Smith &

Related US. Application Data Eden 63 C z f 1971, aggrtllrgulgon 0 Ser N0 176 376 Nov 1 A S RACT A fixture for retaining a drill bit during a grinding op [52] US. Cl. 51/71, 51/219 R r i n f r r f g the Same, h device in l ing a [51] Int. Cl B2411 3/26 li e ble guillotine frame along a track bolted along a [58] Field of Search 51/71, 73 R, 92 R, 98 R, work bench, the guillotine frame including a fixed 51/219, 224, 206, 288; 269/140, 145, 251 lower jaw with a V-shaped notch upon which the drill bit rests, and a vertically slideable upper jaw with an [56] Ref r nc s Cit d inverted V-shaped notch for placement against the UNITED STATES PATENTS upper side of the drill bit and securing the same during 664,361 12/1900 Renner 269/252 x grmdmg Operanon 2,078,306 4 1937 Baalmann 51/219 R 2 Claims, 4 Drawing Figures mzmmw f 519% 3.841 T,02s

Hg. 3 Fig. 4

Byron W. Howard DRILL BIT GRINDER AND REFACER This is a continuation of application Ser. No. 176,376, filed Nov. 1, 1971. and now abandoned.

This invention relates generally to holding fixtures. More specifically the present invention relates to holding fixtures for drill bits.

A principal object of the present invention is to provide a fixture for retaining a drill bit during a refacing or a grinding operation of the same.

Another object of the present invention is to provide a drill bit grinder and refacer which can be quickly and easily operated.

Still another object of the present invention is to provide a drill bit grinder and refacer wherein the supporting frame maybe maintained relatively steady so that a process of grinding or refacing can be accomplished upon the drill bit.

Other objects of the present invention are to provide a drill bit grinder and refaser which is simple in design, inexpensive to manufacture, rugged in construction, easy to use and efficient in operation.

These and other objects will be readily evident upon a study of the following specification and the accompanying drawing wherein:

FIG. 1 is a front elevation view of a grinder cone,

FIG. 2 is a longitudinal cross sectional view of the grinder cone secured upon the threaded end of a motor shaft,

FIG. 3 is a front elevation view of the drill bit grinder and refasers integral system, and

FIG. 4 is a fragmentary perspective view thereof showing particularly one side of the supporting frame thereof.

Referring now to the drawing in detail, the reference numeral represents a drill bit grinder and refacer according to the present invention wherein there is a guillotine frame 11 which is slideably movable along a track plate 12 that is secured by means of bolts 13 to a work bench 14.

The frame 11 includes a pair of upstanding generally triangular plates 15 each one of which at its lower end rests upon ball bearings 16 so that they may slide relatively friction free upon the track plate 12 as shown. Each of the plates 15 includes a central vertically extending channel 17, the channels 17 of the two plates 15 facing toward each other so that an upper and a lower jaw 18 and 19 respectively are vertically slideable within the channels.

The plates 15 are maintained rigidly secured together by means of a top plate 20 over the upper end of the plates and a bolt guide 21 between a lower portion of the plates 15.

The upper jaw 18 has a threaded fly head bolt 22 attached rotatably free there to, the bolt 22 extending through a threaded opening in the plate 20 and fitted with a lock nut 23. Another fly head bolt 24 is engaged to a threaded opening in the bolt guide 21 and is fitted with a lock nut 25, the end of the bolt being retained rotatably free within the lower jaw 19. It is now evident by rotating the fly head bolts, the jaws can be moved upwardly or downwardly so that a drill bit 26 can be fitted between V-shaped notches 27 'formed on each of the jaws 19 and 18. Thus the drill bit can be retained during a grinding or refacing operation.

As shown in FIGS. 1 and 2 of the drawing, the present invention incorporates a grinder cone 27 havng a conical toothed opening 28 into which the end of the drill bit is insertable. The grinder cone at its opposite end has a screw thread 29 so that it can be fitted upon the threaded end 30 of a motor shaft 31.

In operative use, it is now evident that the drill bit can be refaced and ground while the drill bit is retained stationarily within the frame 1 1, the frame 11 being movable along the track plate so that the drill bit can be inserted into an moved outward of the cone opening.

What I now claim is;

I. A drill bit grinding fixture comprising, in combination:

a baseplate having spaced horizontal tracks;

a frame slidable in the tracks of said baseplate, in-

cluding side members configured to be received in said tracks and upper and lower cross members interconnecting said side members;

aligned vertically directed grooves in said side members;

first and second jaw plates vertically slidable at their ends in said grooves to have horizontally extending abutting edges;

aligned V-shaped notches in said abutting edges;

and means carried on each of said cross members for forcing said plates toward a position of edge-toedge contact so as to grip a drill bit between said notches,

so that when said frame slides in said tracks, said bit moves along its own axis.

2. Apparatus according to claim 1 together with grinding means and means for rotating said grinding means about an axis coincident with the axis of the drill bit, so that when said frame slides, said bit contacts said grinder means coaxially. 

1. A drill bit grinding fixture comprising, in combination: a baseplate having spaced horizontal tracks; a frame slidable in the tracks of said baseplate, including side members configured to be received in said tracks and upper and lower cross members interconnecting said side members; aligned vertically directed grooves in said side members; first and second jaw plates vertically slidable at their ends in said grooves to have horizontally extending abutting edges; aligned V-shaped notches in said abutting edges; and means carried on each of said cross members for forcing said plates toward a position of edge-to-edge contact so as to grip a drill bit between said notches, so that when said frame slides in said tracks, said bit moves along its own axis.
 2. Apparatus according to claim 1 together with grinding means and means for rotating said grinding means about an axis coincident with the axis of the drill bit, so that when said frame slides, said bit contacts said grinder means coaxially. 